服务器搭建3 安装libevent2.0.20

1.检测是否安装

安装了的话应该是这样的：如果不是，那就装一下。

root@iZ23nyl8frqZ:/home/upload# ls -a /usr/lib |grep libevent
libevent-2.0.so.5
libevent-2.0.so.5.1.9
libevent.a
libevent_core-2.0.so.5
libevent_core-2.0.so.5.1.9
libevent_core.a
libevent_core.la
libevent_core.so
libevent_extra-2.0.so.5
libevent_extra-2.0.so.5.1.9
libevent_extra.a
libevent_extra.la
libevent_extra.so
libevent.la
libevent_pthreads-2.0.so.5
libevent_pthreads-2.0.so.5.1.9
libevent_pthreads.a
libevent_pthreads.la
libevent_pthreads.so
libevent.so

2.下载

http://libevent.org/

3.安装

tar -xf libevent-2.0.22-stable.tar.gz

./configure –prefix=/usr         //配置目录
make
sudo make install

4.验证

5.测试

服务器端ser.c

#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <stdio.h>
#include <string.h>
#include <event.h>
#include <stdlib.h>

#define PORT        25341
#define BACKLOG     5
#define MEM_SIZE    1024

struct event_base* base;
struct sock_ev
{
    struct event* read_ev;
    struct event* write_ev;
    char* buffer;
};

void release_sock_event(struct sock_ev* ev)
{
    event_del(ev->read_ev);
    free(ev->read_ev);
    free(ev->write_ev);
    free(ev->buffer);
    free(ev);
}

void on_write(int sock, short event, void* arg)
{
    char* buffer = (char*)arg;
    send(sock, buffer, strlen(buffer), 0);

    free(buffer);
}

void on_read(int sock, short event, void* arg)
{
    struct event* write_ev;
    int size;
    struct sock_ev* ev = (struct sock_ev*)arg;
    ev->buffer = (char*)malloc(MEM_SIZE);
    bzero(ev->buffer, MEM_SIZE);
    size = recv(sock, ev->buffer, MEM_SIZE, 0);
    printf("receive data:%s, size:%d
", ev->buffer, size);
    if (size == 0) 
    {
        release_sock_event(ev);
        close(sock);
        return;
    }
    event_set(ev->write_ev, sock, EV_WRITE, on_write, ev->buffer);
    event_base_set(base, ev->write_ev);
    event_add(ev->write_ev, NULL);
}

void on_accept(int sock, short event, void* arg)
{
    struct sockaddr_in cli_addr;
    int newfd, sin_size;
    struct sock_ev* ev = (struct sock_ev*)malloc(sizeof(struct sock_ev));
    ev->read_ev = (struct event*)malloc(sizeof(struct event));
    ev->write_ev = (struct event*)malloc(sizeof(struct event));
    sin_size = sizeof(struct sockaddr_in);
    newfd = accept(sock, (struct sockaddr*)&cli_addr, &sin_size);
    event_set(ev->read_ev, newfd, EV_READ|EV_PERSIST, on_read, ev);
    event_base_set(base, ev->read_ev);
    event_add(ev->read_ev, NULL);
}

int main(int argc, char* argv[])
{
    struct sockaddr_in my_addr;
    int sock;

    sock = socket(AF_INET, SOCK_STREAM, 0);
    int yes = 1;
    setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(int));
    memset(&my_addr, 0, sizeof(my_addr));
    my_addr.sin_family = AF_INET;
    my_addr.sin_port = htons(PORT);
    my_addr.sin_addr.s_addr = INADDR_ANY;
    bind(sock, (struct sockaddr*)&my_addr, sizeof(struct sockaddr));
    listen(sock, BACKLOG);

    struct event listen_ev;
    base = event_base_new();
    event_set(&listen_ev, sock, EV_READ|EV_PERSIST, on_accept, NULL);
    event_base_set(base, &listen_ev);
    event_add(&listen_ev, NULL);
    event_base_dispatch(base);

    return 0;
}

客户端client.c：

#include <unistd.h>
#include <stdio.h>
#include <fcntl.h>
#include <netdb.h>
#include <sys/socket.h>
#include <stdlib.h>
#include <string.h>
#define cerror(str) do{perror(str); exit(EXIT_FAILURE); }while(0)

static int port; 
static char addr[256];
static int nlen;
static char msg[]="hello
";
int main(int argc, char*argv[])
{
    int fd;
    struct sockaddr_in sin;
    
    memset(&sin, 0, sizeof(sin));
    sin.sin_family = AF_INET;
  
    if(argc<3)
    {
        port = 8888;
    }else
    {
        port = atoi(argv[2]);
    }
    
    sin.sin_port = htons(port);
    
    if(argc<2)
    {
        strcpy(addr, argv[1]);
        if (inet_pton(AF_INET, addr, &(sin.sin_addr) )<0)
        {
             struct hostent *psh;  
             psh=gethostbyname(addr);
             if(psh!=NULL)
                inet_pton(AF_INET, psh->h_addr, &(sin.sin_addr) );
             else
                cerror("inet_pton");
        }
    }
    
    if((fd=socket(AF_INET, SOCK_STREAM, 0))<0)
        cerror("socket");
    
    if(connect(fd, (struct sockaddr*)&sin, sizeof(sin))<0 )
        cerror("sonnect");
    
    if( (nlen = write(fd,msg, strlen(msg)))<0 )
        cerror("write");
        
    if( (nlen = read(fd,msg, strlen(msg)))<0 )
        cerror("read");
    msg[nlen]='';
    printf("msg: %s
", msg);
    return 0;
}

编译

chen@chen-book1:~/libevent20/sample$ gcc echo_client.c -o client
chen@chen-book1:~/libevent20/sample$ gcc ser.c -o ser -levent
chen@chen-book1:~/libevent20/sample$ ./ser &
[1] 6995
chen@chen-book1:~/libevent20/sample$ ./client localhost 25341
receive data:hello
, size:6
msg: hello

receive data:, size:0
chen@chen-book1:~/libevent20/sample$ ./client localhost 25341
receive data:hello
, size:6
msg: hello